
/**
 * @(#) GenEntityMysql.java	2017-2-8 下午3:06:18
 *
 * Copyright (c) 2014-2015 Diyvc, Inc.
 * 103 Sports Road, Victoria Plaza tower 1104, Tianhe District Guangzhou City, China.
 * All rights reserved.
 * 一键生成数据库实体类工具包
 */
package com.mpyy.tool;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class Mysql2EntityGenerator {
    //F:\Desktopfile\mpyy\mpyymanager\mpyy_pojo\src\main\java\com\mpyy\pojo
    private String packageOutPath = "com.mpyy.pojo";//指定实体生成所在包的路径
    private String url = "/mpyy_pojo/src/main/java/";
    private String authorName = "tangneng";//作者名字
    private String tablename;//表名
    private String[] colnames; // 列名数组
    private String[] colTypes; //列名类型数组
    private int[] colSizes; //列名大小数组
    private boolean f_util = false; // 是否需要导入包java.util.*
    private boolean f_sql = false; // 是否需要导入包java.sql.*
    private boolean f_lombok = true; //是否导入lombok

    //数据库连接
    private static final String URL = "jdbc:mysql://localhost:3306/mpyy";
    private static final String NAME = "root";
    private static final String PASSWORD = "123456";
    private static final String DRIVER = "com.mysql.cj.jdbc.Driver";

    /*
     * 构造函数
     */
    public Mysql2EntityGenerator(Connection con, String tableName) {
        this.tablename = tableName;
        //创建连接
        //查要生成实体类的表
        String sql = "select * from " + tablename;
        PreparedStatement pStemt = null;
        try {

            pStemt = con.prepareStatement(sql);
            ResultSetMetaData rsmd = pStemt.getMetaData();
            int size = rsmd.getColumnCount();    //统计列
            colnames = new String[size];
            colTypes = new String[size];
            colSizes = new int[size];
            for (int i = 0; i < size; i++) {
                colnames[i] = rsmd.getColumnName(i + 1);
                colTypes[i] = rsmd.getColumnTypeName(i + 1);

                if (colTypes[i].equalsIgnoreCase("datetime") || colTypes[i].equalsIgnoreCase("date") ) {
                    f_util = true;
                }
                if (colTypes[i].equalsIgnoreCase("image") || colTypes[i].equalsIgnoreCase("text")) {
                    f_sql = true;
                }
                colSizes[i] = rsmd.getColumnDisplaySize(i + 1);
            }

            String content = parse(colnames, colTypes, colSizes);

            try {
                File directory = new File("");
                String outputPath = directory.getAbsolutePath() + url + this.packageOutPath.replace(".", "/") + "/" + parseName(tablename) + ".java";
                FileWriter fw = new FileWriter(outputPath);
                PrintWriter pw = new PrintWriter(fw);
                pw.println(content);
                pw.flush();
                pw.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
        }
    }

    /**
     * 功能：生成实体类主体代码
     *
     * @param colnames
     * @param colTypes
     * @param colSizes
     * @return
     */
    private String parse(String[] colnames, String[] colTypes, int[] colSizes) {
        StringBuffer sb = new StringBuffer();

        sb.append("package " + this.packageOutPath + ";\r\n");
        sb.append("\r\n");
        //判断是否导入工具包
        if (f_util) {
            sb.append("import java.util.Date;\r\n");
        }
        if (f_sql) {
            sb.append("import java.sql.*;\r\n");
        }
        if (f_lombok) {
            sb.append("import lombok.*;\r\n");
        }
        /*sb.append("import javax.persistence.Column;\r\n");
        sb.append("import javax.persistence.Entity;\r\n");
        sb.append("import javax.persistence.GeneratedValue;\r\n");
        sb.append("import javax.persistence.GenerationType;\r\n");
        sb.append("import javax.persistence.Id;\r\n");
        sb.append("import javax.persistence.Table;\r\n");
        sb.append("import javax.persistence.Temporal;\r\n");
        sb.append("import javax.persistence.TemporalType;\r\n");
        sb.append("import org.springframework.format.annotation.DateTimeFormat;\r\n");*/

        //注释部分
        sb.append("/**\r\n");
        sb.append("* " + tablename + " 实体类\r\n");
        sb.append("* " + new Date() + " " + this.authorName + "\r\n");
        sb.append("*/ \r\n");
        //实体部分
        /*sb.append("@Entity\r\n");
        sb.append("@Table(name = \"" + tablename + "\")\r\n");*/
        sb.append("@Setter\r\n");
        sb.append("@Getter\r\n");
        sb.append("@AllArgsConstructor\r\n");
        sb.append("@NoArgsConstructor\r\n");
        sb.append("@ToString\r\n");
        sb.append("public class " + parseName(tablename) + "{\r\n");
        processAllAttrs(sb);//属性
        /*processAllMethod(sb);//get set方法*/
        sb.append("}\r\n");

        //System.out.println(sb.toString());
        return sb.toString();
    }

    /**
     * 功能：生成所有属性
     *
     * @param sb
     */
    private void processAllAttrs(StringBuffer sb) {

        for (int i = 0; i < colnames.length; i++) {
            String column = parseNameNotFirst(colnames[i]);
            if (column.equals("fileSize")) {
                System.out.println("here");
            }
            sb.append("\r\n");
           /* if ("id".equals(column)) {
                sb.append("\t@Id\r\n");
                sb.append("\t@GeneratedValue(strategy = GenerationType.IDENTITY)\r\n");
                sb.append("\t@Column(name = \"" + colnames[i] + "\", unique = true, nullable = false)\r\n");
            } else {
                sb.append("\t@Column(name = \"" + colnames[i] + "\")\r\n");
            }
            if ("Date".equals(sqlType2JavaType(colTypes[i]))) {
                sb.append("\t@DateTimeFormat(pattern = \"yyyy-MM-dd HH:mm:ss\")\r\n");
                sb.append("\t@Temporal(value = TemporalType.TIMESTAMP)\r\n");
            }*/
            sb.append("\tprivate " + sqlType2JavaType(colTypes[i]) + " " + column + ";\r\n");
        }

    }

    /**
     * 功能：生成get、set方法
     *
     * @param sb
     */
    private void processAllMethod(StringBuffer sb) {

        for (int i = 0; i < colnames.length; i++) {

            sb.append("\r\n");
            sb.append("\tpublic void set" + parseName(colnames[i]) + "(" + sqlType2JavaType(colTypes[i]) + " " +
                    parseNameNotFirst(colnames[i]) + "){\r\n");
            sb.append("\t\tthis." + parseNameNotFirst(colnames[i]) + "=" + parseNameNotFirst(colnames[i]) + ";\r\n");
            sb.append("\t}\r\n");
            sb.append("\tpublic " + sqlType2JavaType(colTypes[i]) + " get" + parseName(colnames[i]) + "(){\r\n");
            sb.append("\t\treturn " + parseNameNotFirst(colnames[i]) + ";\r\n");
            sb.append("\t}\r\n");
        }

    }


    /**
     * 描述：第一个首字母不大写，后面大写
     *
     * @param name
     * @return String
     */
    public String parseNameNotFirst(String name) {
        StringBuffer sb = new StringBuffer();
        String[] array = name.split("_");
        if (array.length > 0) {
            for (int i = 0; i < array.length; i++) {
                if (i > 0) {
                    sb.append(initcap(array[i]));
                } else {
                    sb.append(array[i]);
                }
            }
        }

        return sb.toString();
    }

    /**
     * 描述：全部首字母大写
     *
     * @param name
     * @return String
     */
    public String parseName(String name) {
        StringBuffer sb = new StringBuffer();
        String[] array = name.split("_");
        if (array.length > 0) {
            for (String string : array) {
                sb.append(initcap(string));
            }
        }

        return sb.toString();
    }

    /**
     * 功能：将输入字符串的首字母改成大写（修改成驼峰法）
     *
     * @param str
     * @return
     */
    private String initcap(String str) {

        char[] ch = str.toCharArray();
        if (ch[0] >= 'a' && ch[0] <= 'z') {
            ch[0] = (char) (ch[0] - 32);
        }

        return new String(ch);
    }

    /**
     * 功能：获得列的数据类型
     *
     * @param sqlType
     * @return
     */
    private String sqlType2JavaType(String sqlType) {

        if (sqlType.equalsIgnoreCase("bit")) {
            return "Boolean";
        } else if (sqlType.equalsIgnoreCase("tinyint")) {
            return "Byte";
        } else if (sqlType.equalsIgnoreCase("smallint")) {
            return "Short";
        } else if (sqlType.equalsIgnoreCase("int") || sqlType.equalsIgnoreCase("INT UNSIGNED")) {
            return "Integer";
        } else if (sqlType.equalsIgnoreCase("bigint")) {
            return "Long";
        } else if (sqlType.equalsIgnoreCase("float")) {
            return "Float";
        } else if (sqlType.equalsIgnoreCase("decimal") || sqlType.equalsIgnoreCase("numeric")
                || sqlType.equalsIgnoreCase("real") || sqlType.equalsIgnoreCase("money")
                || sqlType.equalsIgnoreCase("smallmoney")) {
            return "Double";
        } else if (sqlType.equalsIgnoreCase("varchar") || sqlType.equalsIgnoreCase("char")
                || sqlType.equalsIgnoreCase("nvarchar") || sqlType.equalsIgnoreCase("nchar")
                || sqlType.equalsIgnoreCase("text")) {
            return "String";
        } else if (sqlType.equalsIgnoreCase("datetime") || sqlType.equalsIgnoreCase("date")) {
            return "Date";
        } else if (sqlType.equalsIgnoreCase("image")) {
            return "Blod";
        }

        return null;
    }


    public static void main(String[] args) {
        List<String> tableList = new ArrayList<String>();
        Connection con;
        try {
            Class.forName(DRIVER);
            con = DriverManager.getConnection(URL,NAME,PASSWORD);
            DatabaseMetaData  dm = con.getMetaData();
            ResultSet rs  = dm.getTables(con.getCatalog(), "root", null, new String[]{"TABLE"});
            while(rs.next()) {
                tableList.add(rs.getString("TABLE_NAME"));
                System.out.println("得到表名："+rs.getString("TABLE_NAME"));
            }
			if (tableList!=null) {
				for (String tableName : tableList) {
					new Mysql2EntityGenerator(con,tableName);
				}
			}
           /* new Mysql2EntityGenerator(con,"file_attachment_info");*/
        } catch (ClassNotFoundException e1) {
            e1.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

}
